1 /* vi: set sw=4 ts=4: */
4 #define UDHCP_DHCPD_H 1
6 PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
8 /************************************/
9 /* Defaults _you_ may want to tweak */
10 /************************************/
12 /* the period of time the client is allowed to use that address */
13 #define LEASE_TIME (60*60*24*10) /* 10 days of seconds */
14 #define LEASES_FILE CONFIG_DHCPD_LEASES_FILE
16 /* where to find the DHCP server configuration file */
17 #define DHCPD_CONF_FILE "/etc/udhcpd.conf"
21 struct option_set *next;
25 struct static_lease *next;
30 struct server_config_t {
31 uint32_t server_nip; /* Our IP, in network order */
32 #if ENABLE_FEATURE_UDHCP_PORT
35 /* start,end are in host order: we need to compare start <= ip <= end */
36 uint32_t start_ip; /* Start address of leases, in host order */
37 uint32_t end_ip; /* End of leases, in host order */
38 struct option_set *options; /* List of DHCP options loaded from the config file */
39 char *interface; /* The name of the interface to use */
40 int ifindex; /* Index number of the interface to use */
41 uint8_t arp[6]; /* Our arp address */
42 uint32_t lease; /* lease time in seconds (host order) */
43 uint32_t max_leases; /* maximum number of leases (including reserved address) */
44 uint32_t auto_time; /* how long should udhcpd wait before writing a config file.
45 * if this is zero, it will only write one on SIGUSR1 */
46 uint32_t decline_time; /* how long an address is reserved if a client returns a
48 uint32_t conflict_time; /* how long an arp conflict offender is leased for */
49 uint32_t offer_time; /* how long an offered address is reserved */
50 uint32_t min_lease; /* minimum lease time a client can request */
51 uint32_t siaddr_nip; /* next server bootp option */
54 char *notify_file; /* What to run whenever leases are written */
55 char *sname; /* bootp server name */
56 char *boot_file; /* bootp boot file option */
57 struct static_lease *static_leases; /* List of ip/mac pairs to assign static leases */
60 #define server_config (*(struct server_config_t*)&bb_common_bufsiz1)
61 /* client_config sits in 2nd half of bb_common_bufsiz1 */
63 #if ENABLE_FEATURE_UDHCP_PORT
64 #define SERVER_PORT (server_config.port)
66 #define SERVER_PORT 67
72 typedef uint32_t leasetime_t;
73 typedef int32_t signed_leasetime_t;
75 struct dhcpOfferedAddr {
76 uint8_t lease_mac16[16];
77 /* "nip": IP in network order */
79 /* Unix time when lease expires. Kept in memory in host order.
80 * When written to file, converted to network order
81 * and adjusted (current time subtracted) */
83 uint8_t hostname[20]; /* (size is a multiply of 4) */
86 extern struct dhcpOfferedAddr *leases;
88 struct dhcpOfferedAddr *add_lease(
89 const uint8_t *chaddr, uint32_t yiaddr,
90 leasetime_t leasetime, uint8_t *hostname
92 int lease_expired(struct dhcpOfferedAddr *lease) FAST_FUNC;
93 struct dhcpOfferedAddr *find_lease_by_chaddr(const uint8_t *chaddr) FAST_FUNC;
94 struct dhcpOfferedAddr *find_lease_by_yiaddr(uint32_t yiaddr) FAST_FUNC;
95 uint32_t find_free_or_expired_address(const uint8_t *chaddr) FAST_FUNC;
98 /*** static_leases.h ***/
100 /* Config file parser will pass static lease info to this function
101 * which will add it to a data structure that can be searched later */
102 void add_static_lease(struct static_lease **st_lease_pp, uint8_t *mac, uint32_t nip) FAST_FUNC;
103 /* Find static lease IP by mac */
104 uint32_t get_static_nip_by_mac(struct static_lease *st_lease, void *arg) FAST_FUNC;
105 /* Check to see if an IP is reserved as a static IP */
106 int is_nip_reserved(struct static_lease *st_lease, uint32_t nip) FAST_FUNC;
107 /* Print out static leases just to check what's going on (debug code) */
108 void print_static_leases(struct static_lease **st_lease_pp) FAST_FUNC;
111 /*** serverpacket.h ***/
113 int send_offer(struct dhcpMessage *oldpacket) FAST_FUNC;
114 int send_NAK(struct dhcpMessage *oldpacket) FAST_FUNC;
115 int send_ACK(struct dhcpMessage *oldpacket, uint32_t yiaddr) FAST_FUNC;
116 int send_inform(struct dhcpMessage *oldpacket) FAST_FUNC;
121 void read_config(const char *file) FAST_FUNC;
122 void write_leases(void) FAST_FUNC;
123 void read_leases(const char *file) FAST_FUNC;
124 struct option_set *find_option(struct option_set *opt_list, uint8_t code) FAST_FUNC;
127 POP_SAVED_FUNCTION_VISIBILITY